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1.发明授权
公开(公告)号：US3087055A
公开(公告)日：1963-04-23
申请号：US85850159
申请日：1959-12-09
Applicant: GEOPHYSICS CORP OF AMERICA
Inventor： LIEBL HELMUT J
IPC: H01J49/32
CPC classification number: H01J49/32
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